[1] Univ Technol Sydney, Ctr Cardiovasc & Chron Care, Sydney, NSW 2007, Australia
[2] Johns Hopkins Univ, Sch Nursing, Baltimore, MD USA
[3] Oxford Brookes Univ, Fac Hlth & Life Sci, Nursing, Oxford OX3 0BP, England
[4] Univ Technol Sydney, Sydney, NSW 2007, Australia